◎ 题干
A collection of photographs _________in the museum were all taken twenty years ago.   
[     ]
A. on the display      
B. is on the display
C. on display          
D. is on display
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“A collection of photographs _________in the museum were all taken twenty years ago.[ ]A. on the displayB. is on the displayC. on displayD. is on display…”主要考查了你对  【介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。